Proof Research 121665 AR-Style Barrel 6.5 Grendel 18″ Rifle Length Gas System 1:8″ Twist 4 Grooves, 5/8-24 tpi, Carbon Fiber Wrapped

Up to 64% lighter than traditional steel barrels of similar contour. Improved heat dissipation for cooler and longer lasting barrels. Wrapped with high-strength, aerospace-grade carbon fiber impregnated with a proprietary matrix resin.